"Hey Beavis, Like What's
Scattering Dude?

Listen up Dude: Scattering is a wavelength dependent physical
process when ever optical photons interact with molecules.
Scattering causes the direction of the photons to randomly
change. Scattering goes as wavelength-4 meaning
that blue light, being approximately 1.7 times shorter wavelength
than red light, is scattered about 10 times more efficiently.
These multiple scatterings are the reason the sky is blue.

A Scattering Network as explained by Vanessa - note that the
cannon is pointed right at the detector, but the presence of
a scattering screen causes blue photons to go elsewhere - if one
placed detectors there, the blue photons would register on
them. Again, this is why the sky is blue.